Sodium Carbonate → HCID 69230925, compound

Participants

Reaction Steps

Suzuki Coupling Using Aryl Boronic Acids: A mixture of 3-[4-{2-[2-(4-bromo-phenyl)-5-methyl-oxazol-4-yl]-ethoxy}-2-(isopropoxycarbonylamino-methyl)-phenyl]-propionic acid tert-butyl ester (450 mg, 0.75 mmol), 3-pyridineboronic acid (120 mg, 0.97 mmol), triphenylphosphine (6 mg, 0.024 mmol), 2M aqueous sodium carbonate (3 mL) in n-propanol (15 mL) was sparged with nitrogen for 5 min. Palladium acetate (2 mg, 0.008 mmol) was added, and the reaction was heated to reflux under a blanket of nitrogen for 4 h. The reaction mixture was concentrated and then partitioned between water/EtOAc. The organic layer was dried (MgSO4) and concentrated to crude product (290 mg). This material was purified by silica gel column chromatography to yield 3-(2-(isopropoxycarbonylamino-methyl)-4-{2-[5-methyl-2-(4-pyridin-3-yl-phenyl)-oxazol-4-yl]-ethoxy}-phenyl)-propionic acid tert-butyl ester was obtained as a white solid (230 mg, 51%). 1H NMR (CDCl3) δ1.25 (d, 6H), 1.42 (s, 9H), 2.42 (s, 3H), 2.51 (t, 2H), 2.89 (t, 2H), 3.05 (t, 2H), 4.26 (t, 2H), 4.36 (d, 2H), 4.96 (m, 2H), 6.78 (dd, 1H), 6.87 (d, 1H), 7.21 (d, 1H), 7.47 (dd, 1H), 7.67 (d, 2H), 8.00 (dt, 1H), 8.12 (d, 2H), 8.65 (dd, 1H), 8.94 (s, 1H). MS [EI+] m/z 600 (M+H).

Provenance & Evidence